| Nags Nights Limited | Wholesale & retail | 2008 |
| Nails R US by Jolita Limited | Other services | 2023 |
| Naked Design Limited | Wholesale & retail | 2024 |
| Naked Manufacturing Limited | Administrative & support | 2020 |
| Nanoflam Limited | Manufacturing | 2009 |
| Naomi Care Agency Ltd | Health & social care | 2019 |
| NAR Cardiology Services Limited | Health & social care | 2016 |
| NAR Valley Holdings Limited | Financial services | 2016 |
| NAR Valley Timber Frame Limited | Extraterritorial | 2015 |
| Narborough Store Limited | Wholesale & retail | 2022 |
| Narford Shooting Limited | Arts & recreation | 2018 |
| Nash Dredging Limited | Wholesale & retail | 1932 |
| Nashguard Limited | Construction | 2020 |
| Nashss Limited | Construction | 2015 |
| National Roofing Services Ltd | Construction | 2025 |
| Natlyf Retouching Ltd | Professional & scientific | 2019 |
| Natterjack Street Kitchen Ltd | Hospitality | 2024 |
| Nature and Nurture Homeschool CIC | Health & social care | 2024 |
| Nature's Magick Path Ltd | Extraterritorial | 2024 |
| Nautical Developments Limited | Real estate | 2025 |
| Nautical Holdings Limited | Financial services | 2025 |
| Navitas Energy Assessment Solutions Limited | Professional & scientific | 2007 |
| Nayama Consultants Limited | Professional & scientific | 2018 |
| NB Autoworx Ltd | Wholesale & retail | 2026 |
| NBSPV1 Ltd | Real estate | 2025 |
| NC Electrical Contractors Limited | Construction | 2023 |
| NCF Investments Ltd | Real estate | 2022 |
| Nealman Limited | Information & communication | 2022 |
| Neaverson Growers Limited | Agriculture & fishing | 2017 |
| Nelson Family Holdings Limited | Administrative & support | 2026 |
| Nene Produce Limited | Agriculture & fishing | 2016 |
| Nenemen Ltd | Real estate | 2023 |
| Nessus Trading Ltd | Wholesale & retail | 2015 |
| Nest (East Anglia) Limited | Real estate | 2018 |
| NET Care Cambridge Limited | Health & social care | 2009 |
| NET Care East Anglia Group Limited | Financial services | 2023 |
| NET Care MID Norfolk Limited | Health & social care | 2022 |
| NET Care Norfolk Limited | Health & social care | 2008 |
| NET Care North Norfolk Limited | Health & social care | 2022 |
| NET Care West Norfolk Limited | Health & social care | 2022 |
| Network Events Support & Training | Other services | 2000 |
| Neville Barlow Baling Services Limited | Agriculture & fishing | 2009 |
| New Chang Cheng Ltd | Hospitality | 2023 |
| New Generation Farming Ltd | Agriculture & fishing | 2024 |
| New Heritage Barley Limited | Agriculture & fishing | 2014 |
| New Manor Farms (Norfolk) Limited | Agriculture & fishing | 1976 |
| New Stream Generation Limited | Administrative & support | 2015 |
| New Stream Renewables Limited | Energy | 2012 |
| New Windows 2000 Limited | Construction | 2011 |
| Newell Sporting Ltd | Arts & recreation | 2025 |
| Newland Property Ltd | Real estate | 2005 |
| Newmarket Racing Ltd | Information & communication | 2025 |
| Newso Properties Ltd | Real estate | 2019 |
| Nexopt UK Ltd | Wholesale & retail | 2022 |
| Next GEN Groundworks Limited | Construction | 2023 |
| Next Generation Building Services Ltd | Construction | 2016 |
| Next Generation Landscapes Ltd | Construction | 2025 |
| Nexus 5 Limited | Financial services | 2023 |
| NFN Consulting LLP | | 2016 |
| Nfnn Ltd | Information & communication | 2021 |
| Ngage Digital Ltd | Professional & scientific | 2023 |
| NGB Health and Safety Solutions Limited | Professional & scientific | 2009 |
| NHA Engineering Design Limited | Professional & scientific | 2025 |
| Nicholls Industrial Building Services Limited | Construction | 2009 |
| Nick Bithray Reporting Limited | Information & communication | 2018 |
| Nick Buscall Ltd | Health & social care | 2024 |
| Nick Butt (Education) Ltd | Education | 2011 |
| Nick's Property Service Limited | Construction | 2024 |
| Nikrom Ltd | Construction | 2024 |
| Nimmo Buildings EOT Limited | Administrative & support | 2021 |
| Nitrodrive Ltd | Transport & logistics | 2025 |
| NJS Safety Ltd | Professional & scientific | 2012 |
| NKF Planning Consultancy Limited | Professional & scientific | 2016 |
| NNL Investment Ltd | Real estate | 2026 |
| NO.4 Hair and Beauty Ltd | Other services | 2019 |
| NO.TWENTY9 Ltd | Hospitality | 2014 |
| NO1 Rehabilitation and Wellness Centre Limited | Health & social care | 2020 |
| Nobacz Healthcare Limited | Manufacturing | 2019 |
| Noble Family Lettings Ltd | Real estate | 2023 |
| Noble Roofing Limited | Construction | 2006 |
| Nonverbal Aces Ltd | Education | 2026 |
| Norburys Fine Foods Limited | Hospitality | 2015 |
| Norfolk Accountants Limited | Professional & scientific | 2025 |
| Norfolk ARB Hire Ltd | Agriculture & fishing | 2025 |
| Norfolk BC Ltd | Construction | 2025 |
| Norfolk Beach Chalets Limited | Hospitality | 2023 |
| Norfolk Cars Limited | Wholesale & retail | 2003 |
| Norfolk Children's Allergy Limited | Health & social care | 2026 |
| Norfolk CNC Ltd | Manufacturing | 2025 |
| Norfolk Coastal Cafes Ltd | Hospitality | 2021 |
| Norfolk Coastal Rovers Limited | Administrative & support | 2026 |
| Norfolk Couriers Services Ltd | Transport & logistics | 2021 |
| Norfolk Dialysis Limited | Health & social care | 2016 |
| Norfolk DRY Cleaners Limited | Other services | 2023 |
| Norfolk Dwellings Ltd | Real estate | 2018 |
| Norfolk EAR WAX Removal Ltd | Manufacturing | 2020 |
| Norfolk Electrical Limited | Construction | 2019 |
| Norfolk ENT Limited | Health & social care | 2018 |
| Norfolk Event Medical Services (Nems) Ltd | Health & social care | 2025 |
| Norfolk External Rendering Ltd | Construction | 2019 |